Access to phpMyAdmin on Centos7 suddenly stopped working after server reboot.

I set up my Centos7 server about 2 months ago.

phpMyAdmin has been working fine. Yesterday I stopped and restarted the server. Now everything else appears fine, but when I try and access phpmyadmin I get the browser message:

You don’t have permission to access /phpmyadmin/ on this server.

I have googled extensively and as far as I can see, everything is set up correctly.

My phpMyAdmin.conf file contains (relevant parts only):

Alias /phpMyAdmin /usr/share/phpMyAdmin
Alias /phpmyadmin /usr/share/phpMyAdmin

<Directory /usr/share/phpMyAdmin/>
   AddDefaultCharset UTF-8

   <IfModule mod_authz_core.c>
     # Apache 2.4
     <RequireAny>
      #   Require ip 127.0.0.1
       # Require ip ::1
       Require all granted
     </RequireAny>
   </IfModule>
   <IfModule !mod_authz_core.c>
     # Apache 2.2
     Order Deny,Allow
     #Deny from All
     #Allow from 127.0.0.1
     #Allow from ::1
     allow from all
     Require all granted
   </IfModule>
</Directory>

<Directory /usr/share/phpMyAdmin/setup/>
   <IfModule mod_authz_core.c>
     # Apache 2.4
     <RequireAny>
        #  Require ip 127.0.0.1
       # Require ip ::1
       Require all granted  
     </RequireAny>
   </IfModule>
   <IfModule !mod_authz_core.c>
     # Apache 2.2
     Order Deny,Allow
     allow from All
     # Allow from 127.0.0.1
     # Allow from ::1
   </IfModule>
</Directory>

http.conf contains:

<IfModule dir_module>
    DirectoryIndex index.html index.php
</IfModule>

I do have an index.php file in /var/www.html.

Whenever I attempt to access phpMyAdmin, my apache error log shows

Cannot serve directory /usr/share/phpMyAdmin/: No matching DirectoryIndex (index.html) found, and server-generated directory index forbidden by Options directive

I have definitely stopped and restarted Apache, rebooted the server etc, and nothing has improved.

All ideas welcome.